一种新的基于Kruppa方程的摄像机线性自标定方法

针对非线性优化求解Kruppa方程进行摄像机自标定的局部最优问题,提出了一种在特殊情况下的基于Kruppa方程的线性自标定算法.当摄像机在圆周上运动时,首先根据外极线约束关系得到较准确的基本矩阵,然后根据Kruppa方程的未知系数与基本矩阵奇异值分解的参数关系求解摄像机的内外参数.实验结果表明,所得结论和方法是正确和有效的.     

基于Kruppa方程的相机分步自标定方法

提出一种运动变焦相机分步自标定的,邓事先标定相机的纵横比和主点，在假设像素为矩形及主点为图像中心的情况下，基于Kruppa方程线性求解焦距，算法中只需输入基础矩阵，不必预先进行任何类型的投影阵分解或投影束校正。线生求解焦距避免了非线性法的不确定性，实际数值实验表明该方法简单实用。     

视频监控中基于行人跟踪的摄像机自动标定

为了能够用更简易的手段解决视频监控系统中的摄像机参数获取问题,提出了一种基于场景中行人位置信息的摄像机自标定方法。先对由不同位置的行人轮廓中提取出的头脚点位置信息进行筛选,再通过极大似然估计求解出消失点与水平消失线,并根据消失点与消失线信息计算出摄像机的内外参数和投影矩阵。最后根据由重投影统计计算的误差评价系数,采纳RANSAC方法选取最优结果,实现了对参数的优化。实验表明:该方法有效降低了行人信息获取中的观测噪声和过程噪声对摄像机标定的影响,能够得到较理想的摄像机自标定效果。     

视频监控中基于行人跟踪的摄像机自动标定

为了能够用更简易的手段解决视频监控系统中的摄像机参数获取问题,提出了一种基于场景中行人位置信息的摄像机自标定方法。先对由不同位置的行人轮廓中提取出的头脚点位置信息进行筛选,再通过极大似然估计求解出消失点与水平消失线,并根据消失点与消失线信息计算出摄像机的内外参数和投影矩阵。最后根据由重投影统计计算的误差评价系数,采纳RAN SAC方法选取最优结果,实现了对参数的优化。实验表明:该方法有效降低了行人信息获取中的观测噪声和过程噪声对摄像机标定的影响,能够得到较理想的摄像机自标定效果。     

一种基于平面直线的摄像机标定方法

为使标定算法更加灵活、实用，提出了一种基于平面直线的摄像机标定算法．该算法的平面模板要求含有4个以上直线段，只需要摄像机作运动未知的自由移动，在3个以上的方位摄取一个模板上的图像，即可线性求解摄像机的内外参数．实验结果表明，该算法的精度和鲁棒性都较高．     

基于立体靶标的摄像机标定方法

为获取视觉测量系统中二维图像到三维空间位置的变换关系,提出一种基于立体靶标的摄像机标定方法.针对无畸变小孔成像模型,使用最小二乘法求解初始投影矩阵后通过LM准则对其优化;根据多张图像对应的投影矩阵,求解摄像机内参数及各相应外参数;引入二阶径向畸变模型,建立理想图像坐标和实际图像坐标间的方程求解初始畸变系数;使用LM准则...     

空间分数阶Ginzburg-Landau方程的快速求解

对于空间分数阶Ginzburg-Landau方程在离散过程中产生的带有Toeplitz矩阵的线性系统，给出了一种新的快速求解方法.该方法基于循环矩阵可替代Toeplitz矩阵，转变为求解带有预处理的线性系统，因而具有计算优势，并分析了该方法的系数矩阵特征值分布.数值试验表明，该方法比PGSOR法具有更好的收敛行为.     

可化为对称情形的一般特征值问题

设A是一个n×n对称矩阵,我们要解的问题就是要求出特征值λ和对应的n维向量v, 使Av=λv, 此问题我们已有许多方法可解.故提出一个可对角化的解法,同时对求解向量方程Av=λBv（其中v是向量,B是n×n阵）的特征值和特征向量,提出可化为对称情形的一般特征值问题求解．     

浅析矩阵方程求解问题

矩阵方程是指含有未知矩阵的方程当系数矩阵是方阵时,先判断系数矩阵是否可逆．如果可逆,则可以左乘或右乘逆矩阵的方法求得未知矩阵;如方阵不可逆或是系数矩阵不是方阵．则需要用待定元素法通过解方程确定未知矩阵．     

基于OpenCV的挖掘机器人摄像机参数标定

为了建立挖掘机器人视觉系统摄像机测量模型,提高视觉测量精度,分析了挖掘机器人摄像机视觉系统内、外参数成像模型及摄像机非线性畸变参数,确定了适合挖掘机器人视觉系统的标定参数。通过采集自制的棋盘标定模板不同方向的七幅图像,基于OpenCV技术实现了对模板角点的提取。通过七幅图像进行标定实验,实验结果获得了摄像机模型的线性内部参数矩阵,标定出了摄像机非线性模型的径向畸变系数,摄像机外部旋转矩阵及平移向量,并给出了标定参数误差。研究结论表明采用角点提取方法,标定误差可达亚像素级,能够满足挖掘机器人视觉系统的标定及视觉测量精度要求。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with